class  类人猿 {
	void crySpeak(String s) {
		System.out.println(s); 
	}  
}
class People extends 类人猿 {
	void computer(int a,int b) { 
		int c=a*b;
		System.out.println(c); 
	}
	void crySpeak(String s) {
		System.out.println("***"+s+"***"); 
	} 
}
public class Example5_10 {
	public static void main(String args[]) {
		类人猿 monkey;
		People geng = new People();   
		monkey = geng ; //monkey是People对象geng的上转型对象
		monkey.crySpeak("I love this game");//等同于geng.crySpeak("I love this game");
		People people=(People)monkey; //把上转型对象强制转化为子类的对象
		people.computer(10,10);
		}
}
